The US defence department is investigating the possible access to classified information to an Academy Award-winning filmmaker about the US special operation forces mission that killed Osama bin Laden in May, 2011.

The filmmaker, Kathryn Bigelow, is directing a movie about the operation that led to the death of bin Laden.

Rep Peter King, chairman of the House Homeland Security Committee, said in a statement Thursday that the defence department has opened a probe into the matter. Representative King had called in August for an investigation into the access granted to Ms Bigelow and to the studio behind the film, Sony Pictures Entertainment Inc.

A defence department official confirmed the investigation but declined to comment.

King's request for an investigation was prompted by U.S. media reports that leaks about the raid had resulted in the detainment of Pakistanis who were thought by local officials to have helped carry out the operation. The reports also said that Ms Bigelow and her team had received unprecedented access to information about the mission.

"The leaks that followed the successful bin Laden mission led to the arrests of Pakistanis and put in danger the mission's heroes and their families," King said. "I look forward to an update on the investigation and actions taken thus far."

In addition to the department's investigation, the Central Intelligence Agency has begun developing "a written policy to create a single point of reference that will govern future interactions with the entertainment industry," according to CIA correspondence released by Mr King.